#3749A4
Closest named color: Blueberry (#464196). oklch(44.4% 0.148 270.8), rgb(55, 73, 164).
Aa
White text reads best on this color (7.91:1).
About this color
#3749A4 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.148 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.034 away. White text reads best on it, at 7.91:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #3749A4 |
| RGB | rgb(55, 73, 164) |
| HSL | hsl(230, 50%, 43%) |
| OKLCH | oklch(44.4% 0.148 270.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3749A4 | 7.91:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3749A4 | 2.65:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3749A4 text on white | 7.91:1 | AAA | Lc 87.1 | Fine for body text |
| #3749A4 text on black | 2.65:1 | Fails | Lc -15.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBEF9
oklch(80.8% 0.086 270.6)
-
Step 400
400
#819AF6
oklch(70.6% 0.138 271)
-
Step 500
500
#637EF3
oklch(63.1% 0.177 270.8)
-
Step 600
600
#4C64E1
oklch(55.6% 0.191 270.7)
-
Step 700
700
#3E52C4
oklch(49.1% 0.178 270.8)
-
Step 800
800 (this color)
#3749A4
oklch(44.4% 0.148 270.8)
-
Step 900
900
#2C3A7E
oklch(37.7% 0.116 271.1)
-
Step 950
950
#19234A
oklch(27.1% 0.073 270.1)
#3749A4 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0056A7 | 0.044 |
| Deuteranopia (no green cones) | #004CA2 | 0.039 |
| Tritanopia (no blue cones) | #005F6F | 0.123 |
| Achromatopsia (no color) | #515151 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3749A4
#3749A4
oklch(44.4% 0.148 270.8)
- #675100
#675100
oklch(44.5% 0.091 90.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3749A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.045
- Dusk Blue #26538D ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.052
- Sapphire #2138AB ΔE 0.053
- Twilight #4E518B ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.063
Use #3749A4 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.